Search Results for author: Dan Vilenchik

Found 6 papers, 2 papers with code

Data Augmentation for Modeling Human Personality: The Dexter Machine

no code implementations20 Jan 2023 Yair Neuman, Vladyslav Kozhukhov, Dan Vilenchik

Modeling human personality is important for several AI challenges, from the engineering of artificial psychotherapists to the design of persona bots.

Data Augmentation

Revisiting Information Cascades in Online Social Networks

no code implementations1 Aug 2022 Michael Sidorov, Dan Vilenchik

We design several algorithms for this task, ranging from a simple greedy algorithm that only learns $u$'s conditional probability distribution, ignoring the rest of $V$, to a convolutional neural network-based algorithm that receives the activity of all of $V$, but does not receive explicitly the social link structure.

Opinion Spam Detection: A New Approach Using Machine Learning and Network-Based Algorithms

no code implementations26 May 2022 Kiril Danilchenko, Michael Segal, Dan Vilenchik

We propose a new method for classifying reviewers as spammers or benign, combining machine learning with a message-passing algorithm that capitalizes on the users' graph structure to compensate for the possible scarcity of labeled data.

Active Learning BIG-bench Machine Learning +1

A greedy anytime algorithm for sparse PCA

1 code implementation15 Oct 2019 Guy Holtzman, Adam Soffer, Dan Vilenchik

The taxing computational effort that is involved in solving some high-dimensional statistical problems, in particular problems involving non-convex optimization, has popularized the development and analysis of algorithms that run efficiently (polynomial-time) but with no general guarantee on statistical consistency.

Do semidefinite relaxations solve sparse PCA up to the information limit?

no code implementations16 Jun 2013 Robert Krauthgamer, Boaz Nadler, Dan Vilenchik

In fact, we conjecture that in the single-spike model, no computationally-efficient algorithm can recover a spike of $\ell_0$-sparsity $k\geq\Omega(\sqrt{n})$.

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